A Volvo S80L car with a range of about 6000km. User response: after the vehicle has been running for a long time, the meter shows that the tire pressure monitoring system needs to be repaired. Fault diagnosis: this fault is an accidental fault. When the vehicle runs in the city at low speed, the fault will not appear. After the failure occurs, the engine is extinguished and restarted. The fault information on the instrument will disappear automatically. If the fault is not extinguished, the fault information on the instrument will disappear automatically for about 10 min. With special fault detector VIDA, the fault code C 1A60 93 - rear tire pressure sensor signal is stored in the central electronic module. It is normal to measure the tire pressure of each tire. Further inspection revealed that the car did not install any attachments, but only put the sun film on the glass. Using a special tool 9513035 to diagnose the ID number, tire pressure and tire temperature of each tire pressure sensor, it is normal to use the remote control to operate the vehicle and function properly, indicating that the receiver works well; the dismantling receiver and the part number, 31407101, are the latest; the power supply, iron lap and LIN signal of the measuring receiver are normal and related. The connection of the wire connector is not loose and the terminals are in good contact. CEM software is upgraded, and the tire pressure monitoring system is tested and tested. Starting the engine, in the information entertainment system to complete set tire pressure (MY CAR - setting, vehicle setting and tire pressure setting) after the road test, driving about 50 km, failure did not appear, and then turn in. 3 days later, the car returned to the factory. The malfunction and failure code were the same as before. According to the related technical information, the vehicle was again checked, measured and set, and 4 tire pressure sensors were replaced, the TPMS application was downloaded, and even after consultation with the driver, the solar film on the glass was tore off. The road test was about 150 km, and the failure did not appear. 2 days later, the car returned to the factory again. The malfunction and fault code were the same as before. Combined with the previous 2 maintenance experiences, the maintenance idea is rearranged to deduce that the distance between the receiver and the rear tire pressure sensor is too far to cause the bad signal of the car tire pressure sensor after receiving the receiver. The car receiver is installed behind the driver's information module (DIM), which has occurred many times, and the vehicle mounted on the roof of the car has never had the fault. Troubleshooting: extend the receiver wire, transfer the receiver to the rear of the roof window, reset the tire pressure, and test the car, and the fault does not appear again. A few months later, the driver returned to the phone to see if everything was normal and the trouble was completely ruled out.